mod_saslauth, usermanager: Fetch list of mechanisms from usermanager

prosody: net_activate_ports: Check listener exists before trying to open port for it

Merge with 0.5

net.server: Fail to open port if legacy SSL requested, but SSL not available

prosodyctl: Also switch group when we switch user

pposix, mod_posix: Bump pposix version number

pposix: Add setgid() function

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